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This is 6.7rc3 out of the box. Downloaded the Ruby-only version, added Java & Ant plug-ins. I have a project that I downloaded from a private project on Kenai - can give a pointer if that's useful. In the "Project" window I right-click on a folder and select "New Ruby Class", fill in the basic fields, and it blows up 100% of the time, repeatable, with java.lang.NoClassDefFoundError: javax/script/ScriptEngineFactory Logfile attached. The usefulness of the IDE is greatly reduced if I can't make new classes.
Created attachment 83729 [details] 6.7rc3 messages.log
Oh, I should say that I also removed all the nbproject stuff and went through the "New Project" dialog to create a new dialog, taking all the defaults (except for the project folder is there at the root of the source). Made no difference, same symptom.
I installed Java 6, restarted NetBeans, problem gone. Hmm.
Seems to be a duplicate of #167240. *** This issue has been marked as a duplicate of 167240 ***